Improvement in adjustable mill-feeds



N. PETERS, PHOTO-LITHOGRAFER, WASHINGTON, C.

WILLIAM T. DUVALL, 0F GEOIiGETOWN, DISTRIUTYOF COLUMBIA.

Leners retenant. 112,969, 4mediaan 21,1871.

IMPROVEMENT IN ADJUSTABLE MILL-FEEDS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it-mcy concern Be it known that I, WILLIAM T. DUVALL, of the city of Georgetown, in the county of Washington and' District of Columbia, 4have invented certain new and useful Improvements in Adjustabie lilIill-Feeds;7 'and I do hereby declare that the following is afull, clear, and exact description thereof, reference being lhad to the accompanying drawing through letters of reference marked thereon forming part of this specific-ation, and in which- Figure 1 represents a side elevation of a millwith my adjustable feed applied; A

Figure 2 vis a central vertical 'sectionfof the same; and

Figure 3, a horizontal section, taken on the linexx on Iig. 1.

The same letters indicate corresponding parts in all the figures.

In mill-feeds as ordinarily constructed great diiicultyis experienced in effecting al1-adjustment asaccurate as desirable, and even when so adjusted Ait is constantly liable to lvariation from the jar produced by the rapid motion of the running stone.

To remedy this diiiiculty is the object of my inveu` tion, which consistsin various details of construction,

`which will be more fully described by reference tothe drawing, in which- A represents the nether or stationary bur; and B, the runner or upper stone.

C is the casing which surrounds both, all of which may be constructed, supported, and operated in any ordinary or convenient manner. 1

Across the top of the casing O is vrigidly attached a bridge-piece, D, to which is centrally secured a hollow or tubular metallic frame, E, lwhich serves to support the adjustable feed devices. i

This frame E is constructed with two slots, a, on opposite sides, and' one at right angles to them somewhat lower down, for purposes which will be hereinyafter more fully described. It is also of' a slightlyfiaring shape atits upper end, and of a somewhat contracted cylindrical form at its lower portion.

Within this cylindrical frame E is a slidingtube. G, which extends from near the lupper end of the said frame downward, snugly, but freely passing through slots a in the opposite sides of the ii'ame E, and by which it is connected with the forked arm b of the elbow-lever I, which gears, by'a sector at its lower end, with a worm-wheel, J on the horizontal shaft K,

by the rotation of -which the tube G is lraised or lowered, and its proximity to the cup e may be nicely adj usted to regulate the discharge or feed of. grain to the mill bythe centrifugal action of the revolving cup e.

The collar c is secured to the `tube G by set-screws passing through the wrists'n and biting against the periphery of said tube, by loosing which its position ou the lattermay be varied and adj usted.

Within this adjustable tube-G is inserted the "tubular portion f of the funnel F, which is fitted to vextend nearly as low as the ltube G, and so as to be readilyv inserted or removed therefrom.

On the outer end of .the shaft K isa mill-head,'L, which is also grooved around its periphery, so'as to serve as a pulley for operation by a cord, m, extending to'a room below, as represented iu iig. l. Said millhead isalso made adjustable toward and from the axis of the mill, so that, when it is desirable to operate the feed on the same door on which the runner isplaced,

it may be slipped within thev periphery of the casing O, as represented in iig. 2, in which position, when it is desirablev to remove the casing, it. and the entire feed apparatus may be lifted off together and rolled over the door without varyingl theadjustment of any of its parts, v

Having thus described my invention,

What I claim as new, and desire to secure by Letters Patent, ish 4 1.- The combination and arrangement of the vertically-adjustable tube G, with its toothed segmental lever I, and the revolving cup e, for` regulating thefeed, constructed for operation substantially as described.

2. The combination of the adjustable collar c,- having wrist-pins u and set-screws, with the elbow-lever I, its sector, and theworm-wheel J, for adjusting the tube G, substantially as set forth.

3. The mill-head or pulley L, adjustably arranged to operate the feeder G from above,'or by means of a cord, lfrati-om below, as shown and described'.

4. The frame E, constructed as shown and described, and rigidly attached to the bridge-piece D, for supporting the adjustable feed devices, iu` combination with the case O, substantially as set forth.

5. The combination of the tubular frame E, adjustv able feed-tube G, its adjustable collar c, segmental` elbow-lever I, and worm-wheel J, all arranged for op? eration substantiallyas shown and described.

' WM. T. DUVALL.

'Wituesses:

SIDNEY E.. SMITH, W. MoRnrs SMITH. 

